An apparatus used only for receiving the sounds generated by underwater objects is called a passive ______ system.
sonar
The correct answer is sonar.
It is used only for receiving and listening to sounds generated by underwater objects (such as submarine engines, ship propellers, or marine life). Why the other options are incorrect: Fluxmeter (Option 1): An instrument used to measure magnetic flux. Fathometer (Option 3): A specific type of active sonar used primarily to measure the depth of water (by sending a signal straight down to the ocean floor). Hydrometer (Option 4): An instrument used to measure the specific gravity (or relative density) of liquids.
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